EP0497433A2 - Système de démodulation à phase commandée pour communication numérique - Google Patents

Système de démodulation à phase commandée pour communication numérique Download PDF

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Publication number
EP0497433A2
EP0497433A2 EP92201171A EP92201171A EP0497433A2 EP 0497433 A2 EP0497433 A2 EP 0497433A2 EP 92201171 A EP92201171 A EP 92201171A EP 92201171 A EP92201171 A EP 92201171A EP 0497433 A2 EP0497433 A2 EP 0497433A2
Authority
EP
European Patent Office
Prior art keywords
carrier
ratio
output
circuit
digital
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP92201171A
Other languages
German (de)
English (en)
Other versions
EP0497433A3 (en
EP0497433B1 (fr
Inventor
Shousei C/O Nec Corporation Yoshida
Susumu C/O Nec Corporation Otani
Toshiya C/O Nec Corporation Todoroki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP62-156045A external-priority patent/JPH01844A/ja
Priority claimed from JP15604487A external-priority patent/JPS64843A/ja
Priority claimed from JP16210987A external-priority patent/JPS645248A/ja
Priority claimed from JP62175658A external-priority patent/JPS6418339A/ja
Application filed by NEC Corp filed Critical NEC Corp
Publication of EP0497433A2 publication Critical patent/EP0497433A2/fr
Publication of EP0497433A3 publication Critical patent/EP0497433A3/en
Application granted granted Critical
Publication of EP0497433B1 publication Critical patent/EP0497433B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/22—Demodulator circuits; Receiver circuits
    • H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
    • H04L27/2271—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals
    • H04L27/2273—Demodulator circuits; Receiver circuits using coherent demodulation wherein the carrier recovery circuit uses only the demodulated signals associated with quadrature demodulation, e.g. Costas loop
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/26—Measuring noise figure; Measuring signal-to-noise ratio
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0016—Stabilisation of local oscillators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0044—Control loops for carrier regulation
    • H04L2027/0063—Elements of loops
    • H04L2027/0067—Phase error detectors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0044—Control loops for carrier regulation
    • H04L2027/0071—Control of loops
    • H04L2027/0075—Error weighting

Definitions

  • the output of the demodulator is an analog signal having eye patterns at the recovery timing of symbols which corresponds to signal points.
  • Absolute value circuit 2 converts the data d i into an absolute value
  • MSB most significant bit
  • A/D converter 1 The output of A/D converter 1 is delayed by circuit 20 by an amount equal to the total delay introduced by decoder 21 and encoder 22 so that the inputs to the polarity inverter 23 are rendered time-coincident with each other.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Analogue/Digital Conversion (AREA)
EP92201171A 1987-06-23 1988-06-22 Système de démodulation à phase commandée pour communication numérique Expired - Lifetime EP0497433B1 (fr)

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
JP62-156045A JPH01844A (ja) 1987-06-23 Ｃ／ｎ測定回路
JP15604487A JPS64843A (en) 1987-06-23 1987-06-23 C/n measuring circuit
JP156045/87 1987-06-23
JP156044/87 1987-06-23
JP162109/87 1987-06-29
JP16210987A JPS645248A (en) 1987-06-29 1987-06-29 C/n measuring circuit
JP175658/87 1987-07-14
JP62175658A JPS6418339A (en) 1987-07-14 1987-07-14 Pseudo synchronizing detecting circuit
EP88305685A EP0296822B1 (fr) 1987-06-23 1988-06-22 Détecteur du rapport porteuse/bruit pour systèmes de transmission numériques

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP88305685.5 Division 1988-06-22

Publications (3)

Publication Number Publication Date
EP0497433A2 true EP0497433A2 (fr) 1992-08-05
EP0497433A3 EP0497433A3 (en) 1992-09-23
EP0497433B1 EP0497433B1 (fr) 1995-09-20

Family

ID=27473388

Family Applications (2)

Application Number Title Priority Date Filing Date
EP88305685A Expired - Lifetime EP0296822B1 (fr) 1987-06-23 1988-06-22 Détecteur du rapport porteuse/bruit pour systèmes de transmission numériques
EP92201171A Expired - Lifetime EP0497433B1 (fr) 1987-06-23 1988-06-22 Système de démodulation à phase commandée pour communication numérique

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP88305685A Expired - Lifetime EP0296822B1 (fr) 1987-06-23 1988-06-22 Détecteur du rapport porteuse/bruit pour systèmes de transmission numériques

Country Status (5)

Country Link
US (1) US4835790A (fr)
EP (2) EP0296822B1 (fr)
AU (1) AU594621B2 (fr)
CA (1) CA1332450C (fr)
DE (2) DE3886107T2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2721778A1 (fr) * 1994-06-23 1995-12-29 France Telecom Procédé d'estimation d'une erreur de phase résiduelle sur les échantillons d'un signal numérique démodulé, et procédé de correction correspondant.

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US5208835A (en) * 1990-09-24 1993-05-04 In-Situ, Inc. Automatic frequency control system and method for frequency-shift-key data transmission systems
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US5233633A (en) * 1991-06-28 1993-08-03 Motorola, Inc. Automatic frequency control by an adaptive filter
US5255290A (en) * 1992-08-21 1993-10-19 Teknekron Communications System, Inc. Method and apparatus for combined frequency offset and timing offset estimation
US5376894A (en) * 1992-12-31 1994-12-27 Pacific Communication Sciences, Inc. Phase estimation and synchronization using a PSK demodulator
US5440582A (en) * 1993-05-28 1995-08-08 Motorola, Inc. Method and apparatus for determining signal usability
US5440590A (en) * 1993-11-01 1995-08-08 Motorola, Inc. Method and apparatus for producing a usable signal from received diverse modulated signals
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US6026131A (en) * 1995-12-27 2000-02-15 Laurent; Souef Automatic gain control systems
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Publication number Priority date Publication date Assignee Title
FR2721778A1 (fr) * 1994-06-23 1995-12-29 France Telecom Procédé d'estimation d'une erreur de phase résiduelle sur les échantillons d'un signal numérique démodulé, et procédé de correction correspondant.
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Also Published As

Publication number Publication date
US4835790A (en) 1989-05-30
EP0497433A3 (en) 1992-09-23
CA1332450C (fr) 1994-10-11
DE3886107D1 (de) 1994-01-20
AU594621B2 (en) 1990-03-08
EP0296822B1 (fr) 1993-12-08
DE3854505D1 (de) 1995-10-26
DE3886107T2 (de) 1994-05-26
DE3854505T2 (de) 1996-02-22
AU1824888A (en) 1989-01-05
EP0296822A3 (en) 1989-12-13
EP0497433B1 (fr) 1995-09-20
EP0296822A2 (fr) 1988-12-28

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